Convert OTF to WOFF Online Free

You have an OTF font file. You need WOFF for web use. These are different containers for the same font data — the glyph outlines and metadata are identical; WOFF is just compressed and formatted for efficient web delivery.

The WildandFree Font Converter converts OTF to WOFF (and any other direction) directly in your browser. No file upload, no install, no account.

What Changes When You Convert OTF to WOFF

OTF (OpenType) is a desktop font format. It contains the font's glyph data in either CFF (PostScript) or TrueType outline format, plus the full set of OpenType feature tables — ligatures, kerning, small caps, and so on.

WOFF (Web Open Font Format) is a compressed container designed for web delivery. It wraps the same font data in a compressed package with a small header that includes metadata. WOFF files are typically 40–60% smaller than the equivalent OTF — just from the compression, with no loss of glyph quality or feature support.

When you use @font-face in CSS, the browser decompresses the WOFF on the fly and gets the same font data it would have gotten from the OTF directly. The visual output is identical.

Converting OTF to WOFF in Your Browser

1. Open the font converter
2. Drag your OTF file onto the drop zone, or click to browse
3. Select WOFF as the output format
4. Click convert and download the result

The conversion runs locally in your browser — your OTF file never leaves your machine. This is important for fonts under NDA, client-provided brand fonts, or any licensed font that can't be sent to third-party servers.

Conversion typically takes under a second for standard-sized font files.

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Are OpenType Features Preserved in the WOFF?

Yes. WOFF is a container format, not a conversion of the font data itself. All OpenType features embedded in your OTF — ligatures, kerning pairs, small caps, stylistic alternates, contextual forms — are preserved in the WOFF output.

If a font has 1,200 glyphs in OTF, it has 1,200 glyphs in the resulting WOFF. The only thing that changes is the file format and size.

You can verify this by checking the glyph count in the font metadata viewer on both the original OTF and the converted WOFF — the counts should match.

Using the WOFF in Your CSS @font-face

After conversion, use the WOFF like this:

@font-face {
  font-family: 'MyFont';
  src: url('/fonts/myfont.woff2') format('woff2'),
       url('/fonts/myfont.woff')  format('woff');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

If you only have a WOFF (no WOFF2 yet), remove the first src line. WOFF is supported in all browsers including IE9+.

For WOFF2 output — which is 20–30% smaller than WOFF — see the WOFF2 conversion guide for the fonttools path.

Frequently Asked Questions

Is OTF to WOFF conversion lossless?

Yes. WOFF is a compressed container wrapping the same font data. Converting OTF to WOFF and back to OTF produces an identical font. No glyph data, features, or metadata are lost.

Can I use an OTF directly in @font-face instead of converting?

Technically yes — browsers support OTF in @font-face. But the file will be significantly larger than the WOFF equivalent (40–60% larger on average), which slows down page load. WOFF is the preferred format for web delivery.

What is the difference between OTF to WOFF and TTF to WOFF?

The same WOFF container wraps either CFF (PostScript, used in OTF) or TrueType outlines. The process is the same. Both produce a WOFF file of similar relative compression ratio.